Pipeline inspection system

ABSTRACT

An inspection system configured for “no-blow” use in a pressurized gas pipeline includes a push rod wound around a spool for convenient deployment and portability. A camera disposed on one end of the push rod is configured to relay images back to a monitor. A motor is configured for remote actuation by an operator, and provides for self-propelled movement of the camera in the pipeline. An entry tube is configured for sealed entry into the pipeline to facilitate entry of the camera and push rod. A guide shoe at the end of the entry tube provides a smooth transition for the camera and push rod as it leaves the entry tube and enters the pipeline. An automatically deployable and retractable positioning system is used to keep the camera away from an interior surface of the pipeline, and in the case of smaller pipelines, centers the camera within the pipeline.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a division of U.S. patent application Ser. No.12/465,713, filed 14 May 2009, now U.S. Pat. No. 7,940,297, which is adivision of U.S. patent application Ser. No. 11/222,086, filed 8 Sep.2005, now U.S. Pat. No. 7,551,197, each of which is hereby incorporatedherein by reference.

TECHNICAL FIELD

The present invention relates to a pipeline inspection system.

BACKGROUND

For more than 30 years, video inspection has been a baseline fundamentalanalytical tool for the evaluation and assessment of pipeline integrity.Originally developed as an aid for sewer system maintenance, videoinspection equipment and techniques have played a key role in thedevelopment of “no-dig” and “trenchless” pipeline rehabilitationmethods. This is because the choice of the best trenchlessrehabilitation method, for any given application, is often largely basedon the video inspection that takes place prior to the rehabilitation.Thus, the information gleaned from the pre-rehabilitation videoinspection is used as the basis for key decisions that drive the entirerehabilitation process.

The inspection of pipes often falls into two broad categories:inspections performed for purposes of preventative maintenance, andinspections performed as a response to a need for repair maintenance.The former category may include such things as locating cracks in thepipeline prior to their reaching a critical length, discovering thelocation of unknown branches or service tees, determining the exactlocation of valves and fittings, and finding water within the pipeline.In general, video inspection equipment is useful as a proactive tool forassessing the cleanliness, corrosion, and structural integrity of thepipeline. In the case of repair maintenance, high quality videoinspection data is also very important. Indeed, the very nature ofrepair maintenance is such that it may include responding to emergencysituations, particularly where hazardous materials are involved. Thus,the importance of quality video inspection equipment and techniques isfurther underscored.

One attempt to provide a pipe inspection system that can be used in agas pipeline is described in U.S. Pat. No. 5,195,392 (Moore et al.).Moore et al. describes an inspection system for a pipeline that utilizesa camera head at the end of a snake which is fed down the pipeline tocapture images at a desired location. The inspection system of Moore etal. requires two operators: one to feed the snake and camera head downthe pipeline, and a second to view the images captured by the camera andprovide instructions to the operator moving the camera. The snake iswound around a drum, and uncoiled by the first operator as the camera ismanually fed down the pipeline. Moore et al. does note that somecommercially available snakes may have electrically powered drumrotation. The camera may be provided with a number of centralizingmembers which are used to keep the camera approximately centered withinthe cross-section of the pipeline. After the camera is inserted in thepipeline, a curved tube can be positioned about the snake within thepipeline, and clamped in place.

One limitation of the pipeline inspection system described in Moore etal. is that it requires two operators to perform the inspection task.The first is required to feed the snake and camera down the pipeline,while the second is required to view the images from the camera anddirect positioning of the camera by the first operator. In addition, thefirst operator is required to remain in close proximity to the openingof the pipeline, which may be undesirable if the pipeline is carryingpressurized gas. Although Moore et al. does contemplate the use of amotorized snake drum, an operator is still required to feed the snakedown the pipeline under the direction of the second operator. Anotherlimitation of the inspection system described in Moore et al. is thatthe camera must be placed through an opening in the pipeline prior tothe opening being sealed by placement of the curved tube and itsassociated gasket. Thus, the opening to the pipeline remains unsealeduntil the camera head and a portion of the snake are inserted. This maybe particularly undesirable when inspecting a high-pressure gaspipeline.

Therefore, a need exists for an inspection system that can be used toinspect a high-pressure gas pipeline, and that can be installed undersealed conditions so that seals are in place before the inspectionapparatus is inserted into the pipeline. It would also be desirable tohave a pipeline inspection system that would allow a single operator tocontrol a camera from a location away from the pipeline opening,particularly where the pipeline is a high-pressure gas pipeline. Inaddition, it would also be desirable to have a pipeline inspectionsystem with a camera having a positioning system which automaticallydeploys and retracts upon insertion and retraction of the camera,without the need for manual manipulation of the positioning system by anoperator.

SUMMARY

The present invention provides a pipeline inspection system which canused by a single operator, and can be used in a high-pressure gaspipeline and installed under sealed conditions to inhibit the escape ofgas from inside the pipeline. At least one embodiment of the presentinvention includes an entry tube configured for insertion into thepipeline prior to insertion of a camera and push rod. The invention alsoprovides a positioning system for the camera which is automaticallydeployable as it exits the entry tube and enters the pipeline. Further,the positioning system is automatically retractable as it is removedfrom the pipeline and enters the entry tube.

The invention further provides an inspection system for inspecting apressurized gas pipeline that includes an elongate flexible guide memberand a first conduit having first and second ends. The conduit isconfigured for sealed insertion into the pipeline such that the firstend is outside the pipeline, the second end is inside the pipeline, andescape of gas from inside the pipeline is inhibited as the second end isinserted into the pipeline. The first conduit is further configured toreceive the guide member therein, which facilitates entry of the guidemember into the pipeline. A first seal cooperates with the first conduitand the guide member to inhibit gas from the pipeline from escapingthrough an inside of the first conduit. A transition member is locatedadjacent to the second end of the conduit for facilitating a change indirection of the guide member as the guide member enters the pipelinefrom within the conduit. A camera is attached to the guide member, andit is configured to pass through the conduit and into the pipeline.

The invention also provides an inspection system for a pressurizedpipeline having an interior with a first diameter. The inspection systemincludes an elongate flexible guide member having a first end configuredfor entry into the pipeline. An entry tube is configured for insertioninto the pipeline, thereby providing access to the interior of thepipeline for the guide member. A camera has first and second ends, andis disposed adjacent the first end of the guide member. The camera isconfigured to pass through the entry tube and into the pipeline. Abiasing member is disposed between the first end of the guide member andthe camera. The biasing member has a first end axially fixed relative tothe first end of the guide member. The biasing member also has a secondend axially movable relative to the first end of the guide member. Theinspection system also includes at least two flexible arms, each ofwhich has a first end pivotally disposed proximate to one of the ends ofthe camera. Each of the arms also has a second end pivotally disposedproximate to the second end of the biasing member. This facilitatesautomatic outward movement of a portion of each of the arms as thesecond end of the biasing member moves away from the first end of thebiasing member when the arms exit the entry tube into the pipelineinterior. This also facilitates inward movement of a portion of each ofthe arms when the arms are retracted into the entry tube, therebycausing a movement of the second end of the biasing member toward thefirst end of the biasing member.

The invention further provides an inspection system for a pressurizedpipeline which defines a first longitudinal axis. The inspection systemincludes an elongate flexible guide member, and a first conduit havingfirst and second ends and defining a second longitudinal axis. The firstconduit is configured for insertion into the pipeline, and furtherconfigured to receive the guide member therein to facilitate entry ofthe guide member into the pipeline. A camera is attached to the guidemember and configured to pass through the first conduit into thepipeline. A motor arrangement is disposed proximate the first end of theconduit, and is operable to move the guide member through the firstconduit and into the pipeline. A transition member is located adjacentthe second end of the first conduit, and has a first surface forming anoblique angle with the first longitudinal axis, and further forming anoblique angle with the second longitudinal axis. The first surfacefacilitates a change in direction of the guide member as the cameracontacts the first surface of the transition member.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a partial schematic perspective view of one embodiment of aninspection system in accordance with the present invention;

FIG. 2 is a partial fragmentary view of a portion of the inspectionsystem shown in FIG. 1;

FIG. 3 is a fragmentary view of a portion of an entry tube and guideshoe for the inspection system shown in FIG. 1;

FIG. 4 is a partial fragmentary view of a portion of the guide systemshown in FIG. 1, including a positioning system deployed within apipeline;

FIG. 5 is a front plan view of the pipeline and positioning system shownin FIG. 4; and

FIG. 6 is a side plan view showing details of an adapter member shown inFIG. 4.

DETAILED DESCRIPTION

As required, detailed embodiments of the present invention are disclosedherein; however, it is to be understood that the disclosed embodimentsare merely exemplary of the invention that may be embodied in variousand alternative forms. The figures are not necessarily to scale; somefeatures may be exaggerated or minimized to show details of particularcomponents. Therefore, specific structural and functional detailsdisclosed herein are not to be interpreted as limiting, but merely as arepresentative basis for teaching one skilled in the art to variouslyemploy the present invention.

FIG. 1 shows a partially schematic perspective view of a pipelineinspection system 10 in accordance with one embodiment of the presentinvention. The inspection system 10 includes a camera 12 which isattached to an elongate flexible guide member, or push rod 14. The pushrod 14 is wound around a spool 16, which has a video display monitor 18conveniently attached thereto. The monitor 18 is electrically connectedto the camera 12, for providing images from inside a pipeline 20. Asexplained in detail below, a positioning system 22 is disposed betweenthe camera 12 and the push rod 14 for positioning the camera 12 within apipeline, such as the pipeline 20.

The pipeline 20 may be a high-pressure gas pipeline, for example,containing gas at 60 pounds per square inch (psi). To facilitate entryinto the pipeline 20, a valve system 24 is used to provide selectiveaccess to an opening 25 in the pipeline 20. Any valve system thatprovides access to an interior 26 of the pipeline 20 through the opening25 may be used. One example of such a valve system is the valve systemcommercially available from ALH Systems Limited. As an alternative, afitting made from polyethylene, or another polymeric material ormaterials, could be attached to the pipeline 20, for example, byelectrofusion. Other fittings could also be used, for example, a metalnipple could be welded to the pipeline.

Once a fitting is attached to the pipeline 20, a drill (not shown)having a sealed attachment to the fitting, could be used to create theopening 25. The inspection system 10 also includes a first conduit, orentry tube 28, which facilitates entry of the camera 12 and push rod 14into the pipeline 20. A second conduit 30 has a first end 32 which isconfigured for attachment to the valve system 24. As shown in FIG. 2,the second conduit 30 is attached to the pipeline 20 through the valvesystem 24. The second conduit 30 also has a second end 34 having aretaining structure, or clamp arrangement 36, attached thereto. Theclamp arrangement 36 allows the entry tube 28 to be moved up and down toaccommodate different pipeline diameters. Once the entry tube isproperly positioned, the clamp arrangement 36 secures the entry tube 28in place while the pipeline 20 is inspected.

The inspection system 10 is configured for “no-blow” use on pressurizedpipelines, such as the pipeline 20. This means that the inspectionsystem 10 is configured to reduce to a minimum, or completely eliminate,the escape of gas from a pipeline on which it is being used. The entrytube 28 has a first end 38 which has a cap 40 attached thereto. The cap40 contains a first seal, or packing gland 35. The packing gland 35cooperates with the entry tube 28 and the push rod 14 to provide a sealaround the push rod 14 when it is inserted into the pipeline 20. Thepacking gland 35 inhibits gas from the pipeline 20 from escaping throughthe inside 37 of the entry tube 28. In addition, a second seal, made upof three O-rings 39, cooperates with the entry tube 28 and the secondconduit 30 to provide sealed insertion of the entry tube 28 into thepipeline 20. Although the seals 35, 39 are shown as a packing gland andO-rings, respectively, it is understood that the use of different typesof sealing structures is contemplated by the present invention.Moreover, although the packing gland 35 and the O-rings 39 areconfigured to inhibit the escape of gas from the pipeline 20, it isunderstood that some trace amounts of gas from the pipeline 20 may enterthe ambient environment.

In order to move the camera 12 up and down the pipeline 20, a motorarrangement 41 is provided. The motor arrangement 41 includes a motor42, which is connected to a gearbox 44. As explained more fully below,the gearbox 44 contains a number of rollers for facilitating movement ofthe push rod 14 into and out of the pipeline 20. As shown in FIG. 1, themotor arrangement 41 is attached directly to the entry tube 28; thisassembly provides a number of advantages. First, there is no need for aseparate support structure for the motor arrangement 41; rather, it isattached to existing portions of the inspection system 10. In addition,having the motor arrangement 41 in close proximity to the first end ofthe entry tube 28, allows the push rod 14 to be moved forward andbackward in the pipeline 20 without the need for an operator to feed thepush rod 14 at the point of entry. Thus, an operator may actuate themotor 42 remotely, which provides a number of advantages over existinginspection systems. First, use of the motor arrangement 41 allows asingle operator to effectively use the inspection system 10. Secondly,the operator can actuate the motor 42 from a safe distance away from theopening in the pipeline 20. In addition, the use of the motorarrangement 41 provides for controlled, precise movement of the camera12 up and down the pipeline 20, thereby increasing the accuracy of theinspection and the ease with which it is carried out.

The gearbox 44 includes openings 46, 48 which allow the push rod 14 topass therethrough. Also shown in FIG. 1 are handles 50, 52 attached tothe entry tube 28. The handles 50, 52 allow the operator to adjust theentry tube 28 up and down based on the diameter of the pipeline beinginspected. The motor arrangement 41 is attached to the entry tube 28 viaa clamp arrangement 54, which allows the motor arrangement 41 to becompletely removed from the entry tube 28. This helps to facilitatepositioning of the entry tube 28 within a pipeline, such as the pipeline20. The operator merely loosens the clamp arrangement 36, adjusts theheight of the entry tube 28 using the handles 50, 52, and then securesthe position of the entry tube 28 by locking the clamp arrangement 36.

FIG. 2 shows a partial fragmentary side view of a portion of theinspection system 10. As shown in FIG. 2, the gearbox 44 includes firstand second halves 56, 58 which are held together with fasteningarrangements 60, 62. Having the gearbox 44 split in this mannerfacilitates set up of the inspection system 10. For example, to insertthe camera 12 into the pipeline 20, the cap 40 on the entry tube 28 isloosened to allow the camera 12 and the positioning system 22 to passthrough the packing gland under the cap 40 and into the entry tube 28.This may conveniently take place prior to the motor arrangement 41 beingattached to the entry tube 28.

Prior to the motor arrangement 41 being attached to the entry tube 28,the first and second halves 56, 58 can be opened by loosening nuts 64,66 on the fastening arrangements 60, 62. This allows eye bolts 68, 70 tobe pivoted to allow the first and second halves 56, 58 of the gearbox 44to be swung open on a hinge (not shown). The push rod 14 can then beplaced between pairs of rollers 72, 74; 76, 78; and 80, 82. The motor 42can be configured with a gear or gears to drive at least one of therollers, such as the roller 74 shown in FIG. 2. In this way, the rollers72-82 may be driving members, or they may merely act as guides,depending on the particular arrangement within the gearbox 44. As shownin FIG. 2, a second end 84 of the second conduit 30 is configured forattachment to the valve system 24. In the embodiment shown in FIG. 2,the second conduit 30 is welded to a plate 86 which cooperates with thevalve system 24 to ensure that a seal is maintained even in the presenceof high-pressure gas within the pipeline 20.

Also shown in FIG. 2, the entry tube 28 includes a second end 88 and atransition member, or guide shoe 90, disposed proximate to the secondend 88. The guide shoe 90 facilitates a change in direction of the pushrod 14 as it enters the pipeline 20 from within the entry tube 28. Asshown in FIG. 2, the entry tube 28 has a generally round cross-section,having a diameter (D). The guide shoe 90 is configured so that it doesnot extend beyond the outer diameter (D) of the entry tube 28, whichallows the entry tube 28 to be inserted through a relatively small holein the pipeline 20, without interference from the guide shoe 90. Inorder to facilitate entry of the camera 12, the entry tube 28 includesan open channel 92 proximate to its second end 88. As shown in FIG. 2,the guide shoe 90 forms one end of the channel 92.

FIG. 3 shows a portion of the entry tube 28, and in particular a portionnear the second end 88. As shown in FIG. 3, the guide shoe 90 has afirst surface 94 and a second surface 96 generally opposite the firstsurface 94. The second surface 96 is generally convex, which helps toincrease the contact between the second surface 96 and a generallyconcave interior surface 98 of the pipeline 20 (see FIG. 2). As shown inFIG. 2, the first surface 94 of the guide shoe 90 forms an oblique anglewith a first longitudinal axis 100 of the pipeline 20. It also forms anoblique angle with a second longitudinal axis 102 of the entry tube 28.

In the embodiment shown in FIG. 2, the first and second longitudinalaxes 100, 102 form an oblique angle with each other. For example, if thepipeline 20, and therefore its longitudinal axis 100, is generallyhorizontal, then the entry tube 28, and its longitudinal axis 102, arenot oriented vertically. Rather, the entry tube 28 is provided with anangle of approximately 20° away from vertical, which helps to facilitateentry of the camera 12 and push rod 14 into the pipeline 20.

The present invention does, however, contemplate orienting an entrytube, such as the entry tube 28, vertically to a horizontal pipeline.This may be convenient when a method such as keyholing is used to accessthe pipeline. Keyholing attempts to minimize the concrete and/or soilremoval required to access the pipeline; therefore, the access holediameter is relatively small. When keyholing is used, it may not bepractical to orient an entry tube, such as the entry tube 28, at anangle away from vertical. In such a case, the present invention can beconfigured with an entry tube whose longitudinal axis is 90° from thelongitudinal axis of the pipeline it is entering. This is possible, inpart, because of the use of a guide shoe, such as the guide shoe 90.Even if the entry tube 28 were oriented such that the axis 102 was 90°from the axis 100, the guide shoe 90 would provide a smooth transitionfor the camera 12 and push rod 14 from its initial orientation parallelto the entry tube 28, to its later orientation generally parallel to thepipeline 20.

As shown in FIG. 2, the pipeline 20 is large enough that the positioningsystem 22 does not contact the top and bottom of the interior surface98. Rather, in such a large pipeline, such as the pipeline 20, thepositioning system 22 merely keeps the camera 12 from dragging along thebottom of the interior surface 98. FIG. 4 shows an example of the camera12 and the positioning system 22 inside a pipeline 104 having a smallerdiameter than the pipeline 20 shown in FIG. 2. As shown in FIG. 4, thepositioning system 22 keeps the camera 12 generally centered within theinterior of the pipeline 104. The positioning system 22 includes aplurality of flexible arms 106, 108. Although it is possible toconfigure a positioning system, such as the positioning system 22, withonly two flexible arms, the positioning system 22, in fact, has threeflexible arms 106, 108, 110 (see FIG. 5).

As discussed above, the positioning system 22 is automaticallydeployable as it exits the entry tube 28 into a pipeline, and isautomatically retractable as it leaves the pipeline and returns to theentry tube 28. The automatic deployment and retraction of thepositioning system 22 is particularly beneficial in applicationsinvolving high-pressure gas pipelines, where it is desirable to havelittle or no interaction between an operator and an open pipeline. Asshown in FIG. 4, each of the arms 106, 108 (and the arm 110 not visiblein FIG. 4) has pivotal attachments 112, 114 at a first end 116 of thecamera 12. Each of the arms 106, 108 (and 110) also has pivotalattachments 118, 120 at a biasing member 122. In the embodiment shown inFIG. 4, the biasing member 122 is a coil spring which is disposedadjacent a first end 124 of the push rod 14. The spring 122 has a firstend 126 axially fixed relative to the first end 124 of the push rod 14.In particular, the first end 126 is axially fixed by an adapter member128 which is attached to the first end 124 of the push rod 14.

FIG. 6 shows a side view of the adapter 128, including two threadedapertures 130, 132. The adapter 128 may be made in two halves, such thatthe first end 124 of the push rod 14 can be inserted into an opening 134between the two halves of the adapter 128, and threaded fasteners (notshown) can be used to tighten the two halves of the adapter 128 tosecure the push rod 14 therebetween. Also shown in FIG. 6, the adapter128 includes a second opening 136 which is configured to receive one endof a support member 138 (see FIG. 4). As with the first end 124 of thepush rod 14, the adapter 128 can be clamped down on the support member138 after the spring 122 is installed on the outside surface 140 of theadapter 128. Returning to FIG. 4, it is shown that the support member138 is disposed between the first end 124 of the push rod 14 and thefirst end 116 of the camera 12. The support member 138 supports thecamera 12 remotely from the first end 124 of the push rod 14, andthereby provides a distance between them to facilitate use of thepositioning system 22.

As noted above, the spring 122 has a first end 126 that is axially fixedrelative to the first end 124 of the push rod 14. Conversely, a secondend 142 of the spring 122 is axially movable relative to the first end124 of the push rod 14. As shown in FIG. 4, the pivotal attachments 118,120 include apertures 144, 146 through the flexible arms 106, 108. Eachof the apertures 144, 146 has a coil 148 of the spring 122 disposedtherethrough. The coil 148 is near the movable end 142 of the spring122. This facilitates the automatic deployment and retraction of thepositioning system 22.

In particular, as the camera 12 and positioning system 22 leave therelatively small diameter of the entry tube 28 and enter the pipeline104, the second end 142 of the spring 122 moves away from the first end126 of the spring 122. This facilitates an automatic outward movement ofthe arms 106, 108 (and 110) toward an interior surface 150 of thepipeline 104. Similarly, when the positioning system 22 is retractedinto the smaller diameter entry tube 28, an inward force is exerted onthe arms 106, 108, 110 which forces the second end 142 of the spring 122closer to the first end 126 of the spring 122. This means that thepositioning system 22 can be automatically deployed from the smallerdiameter entry tube 28 into a larger diameter pipeline, such as thepipeline 104, without any interaction from a system operator. Similarly,no action is required to retract the positioning system 22, other thanthe retraction of the push rod 14 back into the entry tube 28.

While exemplary embodiments are described above, it is not intended thatthese embodiments describe all possible forms of the invention. Rather,the words used in the specification are words of description rather thanlimitation, and it is understood that various changes may be madewithout departing from the spirit and scope of the invention.Additionally, the features of various implementing embodiments may becombined to form further embodiments of the invention.

What is claimed is:
 1. An inspection system for inspecting a pressurizedgas pipeline that defines a first longitudinal axis, the inspectionsystem comprising: an elongate flexible guide member; a conduitincluding a first end and a second end configured for insertion into thepipeline, the conduit having a cross section with an outer widthdimension and being configured to receive the guide member therein,thereby facilitating entry of the guide member into the pipeline; atransition member adjacent the second end of the conduit forfacilitating a change in direction of the guide member as the guidemember enters the pipeline from within the conduit, the transitionmember being configured to not extend beyond the outer width dimensionof the conduit such that the conduit and transition member can beinserted into the pipeline using keyhole entry techniques; and a cameraattached to the guide member and configured to pass through the conduitand into the pipeline.
 2. The inspection system of claim 1, furthercomprising: a biasing member disposed between a first end of the guidemember and the camera, the biasing member having a first end axiallyfixed relative to the first end of the guide member, and a second endaxially movable relative to the first end of the guide member; and atleast two flexible arms, each of the arms having a first end pivotallydisposed proximate one of the ends of the camera, forming respectivepivotal attachments, and a second end pivotally disposed proximate thesecond end of the biasing member, thereby facilitating automatic outwardmovement of a portion of each of the arms as the second end of thebiasing member moves away from the first end of the biasing member whenthe arms exit the conduit into the pipeline interior, and furtherfacilitating inward movement of a portion of each of the arms when thearms are retracted into the conduit, thereby causing a movement of thesecond end of the biasing member toward the first end of the biasingmember.
 3. The inspection system of claim 2, further comprising asupport member disposed between the first end of the guide member and afirst end of the camera for supporting the camera remotely from thefirst end of the guide member, thereby providing a distance between thefirst end of the guide member and the camera to facilitate use of theflexible arms.
 4. The inspection system of claim 2, wherein the biasingmember includes a coil spring, and the second end of each of the armsincludes an aperture therethrough, the coil spring being disposedthrough each of the apertures, thereby forming the pivotal attachmentsbetween the biasing member and each of the arms.
 5. The inspectionsystem of claim 2, further comprising an adapter member configured forattachment to the first end of the guide member, and further configuredto receive the first end of the biasing member, thereby axially fixingthe first end of the biasing member relative to the first end of theguide member.
 6. The inspection system of claim 1, wherein the crosssection of the conduit is generally circular and the outer widthdimension is an outer diameter of the conduit.
 7. The inspection systemof claim 1, further comprising a motor arrangement disposed proximatethe first end of the conduit and operable to move the guide memberthrough the conduit and into the pipeline.
 8. The inspection system ofclaim 7, wherein the motor arrangement includes a motor and a pair ofwheels driven by the motor and configured to capture the guide membertherebetween, thereby pushing the guide member through the conduit andinto the pipeline.
 9. The inspection system of claim 7, the pressurizedpipeline being selectively accessible through a valve system, andwherein the conduit is a first conduit, the inspection system furthercomprising a second conduit having first and second ends and configuredto receive the first conduit therein, the first end of the secondconduit being configured for attachment to the valve system, therebyfacilitating entry of the first conduit into the pipeline through thevalve system.
 10. The inspection system of claim 9, further comprising aretaining structure disposed proximate the second end of the secondconduit, the retaining structure being configured to secure the firstconduit relative to the second conduit after the first conduit is movedthrough the second conduit and into the pipeline.